A new search service, Library Hub Discover, has just launched, replacing the old COPAC database (which enabled you to search across UK academic and research libraries) and SUNCAT (which searched for journals elsewhere).
Library Hub Discover offers a new and improved interface to search across the catalogues of 100 UK and Irish academic, national and specialist libraries, with many more libraries due to be added soon.
A new related service, Library Hub Compare, enables you to analyse and compare library collections and identify relative strengths. So, if you want to assess which libraries in a region have particularly strong holdings relating to your research area, this is a neat way of doing it.
Read more about the new services and keep up with developments by following JiscLibraryHub.